Date Timezone Oracle PLSQL

SQL>  create table conference_calls (
  2        title   varchar2(100),
  3        phone   varchar2(20),
  4        place   varchar2(100),
  5        starts  timestamp with time zone)
  6    /
Table created.
SQL>
SQL>  insert into conference_calls (title, phone, place, starts)
  2      values ('Sales Strategy', '212.123.4567', 'Washington',
  3              TIMESTAMP '2001-12-01 15:00:00.000000 EST')
  4      /
1 row created.
SQL>
SQL> insert into conference_calls (title, phone, place, starts)
  2   values ('Product Features', '650.123.4567', 'San Francisco',
  3              TIMESTAMP '2001-12-01 17:00:00.000000 PST')
  4    /
1 row created.
SQL>
SQL> insert into conference_calls (title, phone, place, starts)
  2      values ('Football Highlights', '44 1234 5678', 'London',
  3              TIMESTAMP '2001-12-01 20:00:00.000000 GMT')
  4    /
1 row created.
SQL>
SQL>
SQL> select * from conference_calls;
TITLE                                                                                                PHONE
---------------------------------------------------------------------------------------------------- --------------------
PLACE                                                                                                STARTS
---------------------------------------------------------------------------------------------------- ---------------------------------------------------------------------------
Sales Strategy                                                                                       212.123.4567
Washington                                                                                           01-DEC-01 03.00.00.000000 PM EST
Product Features                                                                                     650.123.4567
San Francisco                                                                                        01-DEC-01 05.00.00.000000 PM PST
Football Highlights                                                                                  44 1234 5678
London                                                                                               01-DEC-01 08.00.00.000000 PM GMT
SQL>
SQL> select title, phone
  2        from conference_calls
  3        where starts = TIMESTAMP '2001-12-01 15:00:00.000000 -5:00'
  4    /
TITLE                                                                                                PHONE
---------------------------------------------------------------------------------------------------- --------------------
Sales Strategy                                                                                       212.123.4567
Football Highlights                                                                                  44 1234 5678
SQL>
SQL> drop table conference_calls;
Table dropped.
SQL>
SQL>